diff options
| -rw-r--r-- | include/asm-x86/desc_64.h | 97 |
1 files changed, 52 insertions, 45 deletions
diff --git a/include/asm-x86/desc_64.h b/include/asm-x86/desc_64.h index 7d9c938e69f..bb2009ecbbc 100644 --- a/include/asm-x86/desc_64.h +++ b/include/asm-x86/desc_64.h @@ -1,4 +1,4 @@ -/* Written 2000 by Andi Kleen */ +/* Written 2000 by Andi Kleen */ #ifndef __ARCH_DESC_H #define __ARCH_DESC_H @@ -35,7 +35,7 @@ static inline unsigned long __store_tr(void) * something other than this. */ extern struct desc_struct default_ldt[]; -extern struct gate_struct idt_table[]; +extern struct gate_struct idt_table[]; extern struct desc_ptr cpu_gdt_descr[]; /* the cpu gdt accessor */ @@ -51,40 +51,45 @@ static inline void store_gdt(struct desc_ptr *ptr) asm("sgdt %w0":"=m" (*ptr)); } -static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist) +static inline void _set_gate(void *adr, unsigned type, unsigned long func, + unsigned dpl, unsigned ist) { - struct gate_struct s; - s.offset_low = PTR_LOW(func); + struct gate_struct s; + + s.offset_low = PTR_LOW(func); s.segment = __KERNEL_CS; - s.ist = ist; + s.ist = ist; s.p = 1; - s.dpl = dpl; + s.dpl = dpl; s.zero0 = 0; - s.zero1 = 0; - s.type = type; - s.offset_middle = PTR_MIDDLE(func); - s.offset_high = PTR_HIGH(func); - /* does not need to be atomic because it is only done once at setup time */ - memcpy(adr, &s, 16); -} - -static inline void set_intr_gate(int nr, void *func) -{ + s.zero1 = 0; + s.type = type; + s.offset_middle = PTR_MIDDLE(func); + s.offset_high = PTR_HIGH(func); + /* + * does not need to be atomic because it is only done once at + * setup time + */ + memcpy(adr, &s, 16); +} + +static inline void set_intr_gate(int nr, void *func) +{ BUG_ON((unsigned)nr > 0xFF); - _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0); -} + _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, 0); +} -static inline void set_intr_gate_ist(int nr, void *func, unsigned ist) -{ +static inline void set_intr_gate_ist(int nr, void *func, unsigned ist) +{ BUG_ON((unsigned)nr > 0xFF); - _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist); -} + _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 0, ist); +} -static inline void set_system_gate(int nr, void *func) -{ +static inline void set_system_gate(int nr, void *func) +{ BUG_ON((unsigned)nr > 0xFF); - _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0); -} + _set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, 0); +} static inline void set_system_gate_ist(int nr, void *func, unsigned ist) { @@ -101,24 +106,25 @@ static inline void store_idt(struct desc_ptr *dtr) asm("sidt %w0":"=m" (*dtr)); } -static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type, - unsigned size) -{ +static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, + unsigned type, unsigned size) +{ struct ldttss_desc d; - memset(&d,0,sizeof(d)); + + memset(&d, 0, sizeof(d)); d.limit0 = size & 0xFFFF; - d.base0 = PTR_LOW(tss); - d.base1 = PTR_MIDDLE(tss) & 0xFF; + d.base0 = PTR_LOW(tss); + d.base1 = PTR_MIDDLE(tss) & 0xFF; d.type = type; - d.p = 1; + d.p = 1; d.limit1 = (size >> 16) & 0xF; - d.base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF; - d.base3 = PTR_HIGH(tss); - memcpy(ptr, &d, 16); + d.base2 = (PTR_MIDDLE(tss) >> 8) & 0xFF; + d.base3 = PTR_HIGH(tss); + memcpy(ptr, &d, 16); } static inline void set_tss_desc(unsigned cpu, void *addr) -{ +{ /* * sizeof(unsigned long) coming from an extra "long" at the end * of the iobitmap. See tss_struct definition in processor.h @@ -129,18 +135,18 @@ static inline void set_tss_desc(unsigned cpu, void *addr) set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_TSS], (unsigned long)addr, DESC_TSS, IO_BITMAP_OFFSET + IO_BITMAP_BYTES + sizeof(unsigned long) - 1); -} +} static inline void set_ldt_desc(unsigned cpu, void *addr, int size) -{ +{ set_tssldt_descriptor(&cpu_gdt(cpu)[GDT_ENTRY_LDT], (unsigned long)addr, DESC_LDT, size * 8 - 1); } #define LDT_entry_a(info) \ ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) -/* Don't allow setting of the lm bit. It is useless anyways because - 64bit system calls require __USER_CS. */ +/* Don't allow setting of the lm bit. It is useless anyways because + 64bit system calls require __USER_CS. */ #define LDT_entry_b(info) \ (((info)->base_addr & 0xff000000) | \ (((info)->base_addr & 0x00ff0000) >> 16) | \ @@ -172,12 +178,12 @@ static inline void load_TLS(struct thread_struct *t, unsigned int cpu) for (i = 0; i < GDT_ENTRY_TLS_ENTRIES; i++) gdt[i] = t->tls_array[i]; -} +} /* * load one particular LDT into the current CPU */ -static inline void load_LDT_nolock (mm_context_t *pc, int cpu) +static inline void load_LDT_nolock(mm_context_t *pc, int cpu) { int count = pc->size; @@ -185,7 +191,7 @@ static inline void load_LDT_nolock (mm_context_t *pc, int cpu) clear_LDT(); return; } - + set_ldt_desc(cpu, pc->ldt, count); load_LDT_desc(); } @@ -193,6 +199,7 @@ static inline void load_LDT_nolock (mm_context_t *pc, int cpu) static inline void load_LDT(mm_context_t *pc) { int cpu = get_cpu(); + load_LDT_nolock(pc, cpu); put_cpu(); } |